SK229989A3 - Revolving grate cooler for clinker or the like materials - Google Patents

Abstract

A rotatable grate cooler for continuous and quick cooling of clinker or similar products, comprises of a hollow cylindrical shaped rotatable grate 3 which has a constant or regulated variable rotational movement about its longitudinal axis which is slightly inclined in relation to a horizontal plane. The external cylindrical surface of the rotatable grate has a plurality of slots 8 therein through which passes a constant flow of cold air from pressurized chambers 27. The axial length of the rotatable grate over which this occurs corresponds to the total width of the pressurized chambers. The clinker is introduced through an input duct 1 into the highest part of the internal cylindrical surface of the revolving grate and over cooling plates 8. The flow of pressurized cold air which passes through the slots of the cooling plates cools the clinker down quickly and the warm air produced thereby is conveyed by the input duct 1 to a heating system of e.g. a baking oven, for full use of its thermal energy in combustion. The cooled clinker, having reached a desired temperature, falls out of the rotatable grate gradually under gravity, through the cooling plate slots 8 (fine clinker) or at the final part of the rotatable grate through openings in classifier bars 15 or further, through a crusher 18 for larger particles retained by the bars and is collected by a cell conveyor 20 located beneath the cooler. The conveyor conveys the cooled clinker away for proper storage. <IMAGE>

Description

Rotary grate cooler of clinker or similar materials.

Technical field

The invention relates to a rotary grate cooler of clinker or similar materials. In particular, it relates to a clinker cooler that comes from a sintering furnace where it is produced. very high temperatures according to the prescribed manufacturing process.

BACKGROUND OF THE INVENTION

The term clinker is understood to be raw cement, which consists of macroscopic particles of varying grain size and color, which may vary from light to dark gray, giving the clinker a special appearance that is characteristic until the cement is mixed with aggregates and it is milled into powder form.

Rotary grate clinker coolers are known which use movable cooling plates to cool the clinker, between which the clinker coming from the sintering furnace passes, and which helps to stir it and thereby cool it. However, these movable cooling plates are subject to rapid wear, which leads to a stoppage of the entire device and thus to a production interruption. The rotary grate clinker cooler of this type is large and consumes a great deal of power.

SUMMARY OF THE INVENTION

The above-mentioned drawbacks are eliminated by the rotary grate cooler of clinker or similar materials according to the invention, which is characterized in that the rotating grate in the form of a straight cylinder has through holes between the inner and outer circumferential surfaces uniformly distributed over its axial length corresponding to the total length of the pressure chambers. placed under the rotating grate.

According to a preferred embodiment, these openings are formed in curved perforated cooling plates which are circumferentially mounted on the inner surface of the rotating grate, each corresponding to one or more through holes between the inner and outer peripheral surface of the rotating grate.

According to a further preferred embodiment, a curved solid plate and a broken lift plate are mounted within the rotating grate on its inner surface in a section between the last row of perforated cooling plates and the sorting bars.

It is preferable that sorting bars are attached to the periphery of the rotating grate at the periphery. Furthermore, it is advantageous if an inner sealing system with mechanical sealing elements loaded with springs and / or pneumatic pistons is arranged in the middle of the front part of the rotating grate and the lower mouth of the inlet duct.

According to a further preferred embodiment, an outer sealing system and an output sealing system with mechanical sealing elements, loaded by springs or pneumatic cylinders are arranged on the outer periphery of the rotating grate, on the housing and on the discharge dust channel. In this case, it is advantageous to have longitudinal and peripheral bars over its entire section provided with through-holes in the outer peripheral surface of the rotating grate.

Further, it is preferred that the cooling air plate guides are attached to the inner upper portion of the pressure chambers in the region of the longitudinal and transverse bars forming the reinforcing structure.

According to a further preferred embodiment, the rotating grate is supported by the rolling rims by means of the supporting feet which rest on the base. on the inner surfaces of the rolling rims, the longitudinal axis of the radiator forming an acute angle with the horizontal.

Finally, it is advantageous if a gear ring driven by an adjustable speed motor is mounted on the periphery of the rotating grate.

An advantage of the rotary grate cooler according to the invention is that it requires little space, works very simply, and its function is based on a suitable rotation speed setting of the rotating grate that can be adapted to all requirements of the product. The rotary grate cooler does not contain movable cooling plates, so that there is no excessive wear between them and hence production stops and interruptions. The rotating grate has a low rotation speed and therefore has a long service life and does not require a large amount of energy to drive. The cooler has a high thermal efficiency and at the same time greatly reduces fuel consumption in the kiln, utilizing the secondary air coming from the hot cooler, while rapid cooling of the clinker substantially improves its physical chemical properties and reduces its exit temperature.

Overview of the figures in the drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which: FIG. 1 shows a longitudinal section through a rotary cooler according to the invention, FIG. 2 is a front view of the heat sink of FIG. 1, FIG. 3 is a section along line A-B in FIG. 1, FIG. 4 is a section along line C-D of FIG. 1 and FIG. 5 is a section along the line E-F in FIG. First

DETAILED DESCRIPTION OF THE INVENTION

According to FIG. 1 and 2, the rotary cooler is provided with a feed channel 1, which is made of carbon steel sheet and is lined with heat-resistant bricks from the inside. Through this inlet duct 1, hot clinker enters the interior of the rotating grate 2, namely the cooling plates 8. At the same time, through the inlet duct 1, hot air is discharged from the interior of the rotating grate 3 into the combustion zone of the firing furnace not shown in the drawing. the air.

The rotating grate 2 is the largest and most important part of the radiator. Its purpose is to induce turbulent movement of clinker or other material on curved and perforated

... cooling plates 8 which are attached to its inner surface.

Externally, the rotating grate is sealed by a sealing seals 2, which consist of cast iron or steel sheets, which are pressed either by springs or by pneumatic pistons on opposite sealing surfaces and prevent false cold air from entering the interior of the rotating grate. The rotating grate has a constant vacuum, which is induced by the suction pump of the rolling element.

* fc L

The rotating grate carries on the outer surface both at the front end and at the rear end of the support foot 4 fixed to it or by screwing. these

MO.SM footers and enable and reinforce the rotating grate of the grinding rolls in the right grids

i.al position, Wreaths x i. made of cast iron and precisely machined, they support the rotating grates you wear on threads 22.

The state of the art 6, consisting of steel and casting shafts, forms a mechanical seal when pressed against the same by springs or pneumatic cylinders. The outside prevents the external false air from entering the inside of the rotating grate where it maintains a constant negative pressure,

about. it also prevents ingress of cooling air from the pressure chambers into the environment.

The front part of the rotating grate 6 is enclosed in a casing 4 and welded steel-framed which is e.g. From the bolted portions, the outer constricted air inside the rotating thereby ensures high thermal efficiency of the radiator.

boards. The housing 2 forms stationary grids and keeps all the grate hot

The inner surface of the rotating grate is provided with curved perforated cooling plates S, screwed on to the grating of the 2 ”perforated cooling plates no. the hot clinker fed to the rotating grate j ^{and the} chamber 27 spaced apart from each other. At the same time, their openings feed cold air into the hot clinker mass inside the rotating grate 3, where it promotes the formation of turbulent movement and thus efficient cooling.

the pressure is separated from the rotating ones

End of the rotating grate. closer to its output, it is limited by curved pleated plates which are screwed to a rotating grate 3 called with a face.

Jl. ' and protecting it against hot and abrasion, the rotating grate 3 which is enclosed in the ring is actuated by a toothed ring zz, y here z0. The cover 10 protects the toothed all zz_ from the ingress of dust and at the same time prevents leakage of lubricant from the hole between the gears.

To the rotating grate 2 are lifted plates of 2 _? which protects the rotating grate against hot and clinker particles and clinker particles. on the one hand, they lift up larger to break them by impact and thus allow better cooling of their interior.

-? -

On the output * end of the rotating-enhancing grid are secured sorting poles 15 carbon steel, bolted or welded to the grid You do sorting poles 15 are separated ^1, greater Aperture f ^e s line too large for transport and subsequent grinding and lead them to the crusher i_8, where it is crushed to a suitable size. From the rear end of the grate cooler a discharge dust channel 14 is discharged, which discharges the cooling air containing the clinker dust to a filter system (not shown) to utilize this usable product fraction. An outlet sealing assembly 13 is mounted around the rotating grate 4 and on the discharge dust channel 24 to prevent false air from entering the discharge dust channel 14.

In the rear part of the discharge dust channel 14 there is an upper inspection door 10, which allows inspection and maintenance inside the rotating grate. To access the upper inspection door 10, there is a bridge 17 made of a square * 4 and a sheet metal which are welded together and welded together. screwed. From the rear end of the cooler, a clinker outlet 10 extends through which the cold clinker, which falls between the sorting bars, is discharged to the articulated lawn 20 running under the cooler. Too large pieces of clinker that do not pass through the sorting bars 15 come into the clinker crusher 15, which is also called. hammer mill and is used to reduce the size of large s-line pieces to dimensions suitable for transportation.

Bearings 21 of sliding type, with bronze bushings or with patent metal bushings, support the support rollers;

These support rollers 22 support at both ends of the rotating roller

The gear rims transfer the movement from the reducer 24 to the toothed rim 21, the entire radiator by a rotary movement. The reducer 24 serves a rotating wheel 23 to reduce the speed of the drive motor to a speed suitable for the gear 23 to rotate the rotating grate to the desired speed.

Under rotating c im. £ grid are arranged pressure chambers 27 _of the slov.ži to maintain any air bring about the centrifugal blower 3 O podpredem set a certain pressure, it is pressed through the openings in the apertured cooling plates 8, and thus produces cooling of the hot clinker.

they also make it possible for everyone to gather

The pressure chambers 27 of the cold small clinker particles that have passed through the openings in the holes at the bottom of each pressure chamber 27 as a result of gravity. lower. ends of each pressure chamber is arranged overhead valve 2 O _from a transparent to cool the clinker to the chain conveyor 20, two pressure chambers 7 are open to the lower of the inspection door 25 is such that _the in the pressure chambers. they carry out maintenance work or just visual inspection.

The entire cooler is carried by a load-bearing structure 28 which is welded and screwed from steel-laminated sections and carries all of the cooler components to be mounted on the ground, e.g., inlet duct 7, chambers 27, housing 23, gear 23, crusher 28 and other stationary parts.

Cooling air guide plates 29 are provided in each pressure chamber 27 to guide the cold air.

The cooling air enters directly into the center of the hot clinker mass, ensuring its rapid cooling and thus high cooling efficiency of the radiator. Centrifugal pumps 30 are of conventional construction and serves to hollow air into the pressure chambers 27.

A reinforcing structure 32 is welded to the outer surface of the rotating grate that has the same length in axial direction as all pressure chambers 27. The reinforcing structure 32 serves to reinforce that region of the rotating grate that is weakened by the through holes below the cooling plates 8

electric motor

32, which drives the rotating grate shown with a suitable speed for cooling the clinker. so it works for the administration of clinker or even very high tevlot in the duct of the y-channel - at the end of the firing furnace

Watered h'.ork'v with a liqueur

It is provided with a clean surface of the inlet and the ducts on the new tuner cleats;

7 · t [nC ·· Ί 01 C · 1 plates of his ion

S C • • • • • • • • • • • • • • • • • • • • • • • Rotate the rotating grate. n o r λΙοί l l and gravity evoked not only uniformly ·

- a strip on the lower inner surface of the rotating grate, but also its continuous turbulent movement in the circumferential direction, combined with a slow axial movement towards the outlet end of the cooler where the screening bars 15 are located.

During the entire axial movement on the donated cooling plates 8, cold air streams coming through the hot clinker bed from below recruit through the openings in the perforated cooling. These air jets result in rapid clinker cooling.

All clinker particles that are smaller than the holes in the perforated cooling plates 8 pass through these holes in the same way as the clinker slowly moves towards the outlet end of the cooler and falls countercurrent to the fine air blown from the pressure chambers 27. These small particles are. completely cold and settle at the lower ends of the pressure chambers 27 from where the valves 20 discharge them onto the articulated conveyor.

Clinker particles that are larger than the cooling plates 8 and cannot pass through the holes in the derovated ones.

pass through the condenser in the longitudinal direction until they reach the x 5 sorting bars located at the end of the rotating grid

->

JŽ. '

Kayj are a particle. smaller than will fall due to the articulated conveyor heavily into the openings between the screen clinker and the outlet.

On the other hand, when the clinker pieces are larger than the gaps between the sorting bars 15, they first fall into the clinker holder 18.

where their size is reduced by impact, which is thrown back into the interior of the rotating grate so that small particles of clinker can follow and fall onto the articulated conveyor '20 ', which will transport them for storage.

The cold air coming from the pressure chambers 27 removes a large amount of its heat as it passes through the bed of the upper clinker and rapidly cools it. At the same time it heats up and when it enters the interior of the rotating grate, in the region of its warmer part, which corresponds to the first and second pressure chambers 27, sucks ¹ into the roasting furnace where it serves as secondary combustion air. channel '14,. into a sand filter (not shown) as excess air containing Hnku powder.

Claims (3)

Rotary grate cooler for clinker or similar materials, characterized in that the rotating grate (3) in the form of a straight cylinder / comprises between the inner and outer circumferential surface through holes which are uniformly distributed over its axial length corresponding to the total length of the pressure chambers (27) located below the rotating grate (3). Rotary grate cooler according to claim 1, characterized in that the openings are formed in curved perforated cooling plates (8) which are fixed circumferentially on the inner surface of the rotating grate (3), each corresponding to one or more through holes between and. the outer peripheral surface of the rotating grate (3). 3. A rotary grate cooler according to claim 1, wherein the inside of the rotating grate (3) is thereon. an inner surface mounted in a section between the last row of perforated cooling plates (8) and the sorting bars (15) of the curved solid plate (q) and the broken lift plate (12). Rotary grate cooler according to Claims 1 to 3, characterized in that a sorting bar (15) is attached to the end section of the rotating grate (3). Rotary grate cooler according to Claims 1 to 4, characterized in that an inner sealing system (2) with mechanical sealing elements, loaded with springs and / or is arranged in the middle of the front part of the rotating grate (3) and the lower mouth of the supply channel (i). or pneumatic pistons. 6. Rotary grate cooler according to items 1 to 5, i characterized in that a sealing assembly (s) and an outlet with mechanical sealing elements are provided on the outer periphery of the rotating grate (3), on and on the discharge dust channel (14). pncuma t i ckýv.ii va lei. Rotary grate cooler marked with a box (7) by an external sealing system (23) loaded by springs or according to the points 1 to 6, characterized in that longitudinal and peripheral bars covering its entire section are fixed on the outer peripheral surface of the rotating grate (3). equipped with throughpasses. holes. Rotary grate cooler podie boe :. in that the portions of the pressure chambers (27) in the region of the longitudinal and vertical bars which form the reinforcement Air cooling. g. A rotary grate cooler according to any ^{one of} Claims 8 to 8, characterized in that the rotating grate (3) is supported by the rolling lugs (5) by means of supporting feet (4) resting on the villa spines of the rolling rim surfaces, e sv í rá with horizontal plane sharp 1 duel. Z 0. Rotary grate cooler share Ceny t ír · On the perimeter of the rotating ros tu Berny ver chain (11), powered by engine (37) (3) is fixed by the set points ΐ to o, marked1 Report P V Rotary grate cooler clinker or similar materials (Fig. I) The cooler consists of a rotating grate (3) under which the pressure chambers (oy) are placed, into which the cooling air is blown by centrifugal blowers (3O) and into which the cooled clinker falls. The rotating grate has in the first section on the circumference (S) perforated cooling plates with through holes through which cooling air flows into the clinker box. When the grate (3) rotates, clinker. is continuously rolled over and is effectively cooled by the cooling air, which after being turned into a roasting furnace. Due to the slight inclination of the cooler axis, the clinker bed moves to the outlet end where small pieces are carried into the clinker outlet and larger pieces fall into the clinker crusher (18).